Java: An Introduction to Problem Solving and Programming, 8th Edition

Practice Programs

Practice Programs can generally be solved with a short program that directly applies the programming principles presented in this chapter.

1. Write a static recursive method that returns the number of digits in the integer passed to it as an argument of type int. Allow for both positive and negative arguments. For example, −120 has three digits. Do not count leading zeros. Embed the method in a program, and test it.

2. Write a static recursive method that returns the sum of the integers in the array of int values passed to it as a single argument. You can assume that every indexed variable of the array has a value. Embed the method in a test program.

3. One of the most common examples of recursion is an algorithm to calculate the